Safety razor blade



Aug. 2, 1932. w. c. ROGERS SAFETY RAZOR BLADE Original Filed Dec. 31. 1928 15 nnnnnrznnn nnn WiZZmm C". Hogans,

Patented Aug. 2, 1932 ire WILLIAM 0. ROGERS, O15 CHICAGO, ILLINOIS SAFETY RAZOR BLADE Application filed December 31, 1928, Serial No. 329,424. Renewed February 4, 1932.

The object of the invention is to provide a safety razor blade so formed as to insure it, when placed in the holder, being seated with its cutting edge or edges precisely parallel with the base or guard or both of the holder; to provide a construction of blade by which the paralleling operation of the cutting edges with the guard and base of the holder may be effected readily after the assembly and just prior to the final clamping of the blade and holder parts together; to provide a safety razor blade which, while susceptible of cheap manufacture and low marketing cost, is so formed that the paralleling of its cutting edge or edges with the holder parts may be readily eifected despite variations in the blade forming tools due to quantity production; and to provide a blade in which the edge paralleling operation with the holder is inherent in the blade, so that the latter is adapted for use with conventional holders with whose skin engaging edges the exact parallelism of the cutting edges of the blade is insured.

With these objects in View the invention consists in a construction and combination of parts of which a preferred embodiment is illustrated in the accompanying drawing, wherein:

Figure 1 is a top plan View of a conventional holder for double edged blades, showing the improved blade mounted therein.

Figures 2 and 3 are sectional views on the planes indicated by the lines 22 and 33 of Figure 1.

Figure 1 is a plan view of the blade per se. The invention as illustrated is applied to a safety razor blade with a double cutting edge, such as is carried in a conventional holder consisting of the base 10 provided on a longituism with the guard and base that is essential to effective and easy shaving.

The present invention purposes a form of blade by which parallelism of the cutting edges with the guard and base may be insured despite the varying diameters or widths of the pin receiving holes. The longitudinal edges of the pin receiving holes 17 in the present invention are preferably parallel to the cutting edges of the blade. The holes in each blade are of uniform size and shape, this being not difiicult of attainment in practise, the practical difficulty lying in uniformity of size throughout a large lot or quantity made.

With the parts of the holder and the blade loosely assembled a slight pressure on either end of the blade will engage the seats with the pins and parallel its cutting edge with the edge of the base by reason of one of the inclined edges of the cam slot 18 engaging the adjacent surface of the stud 12. The angle of the engaging edge of the slot with the longitudinal axis of the base 10 is sufiiciently acute to frictionally hold the blade in proper position on the base during further clamping operation thereby enabling the user to devote his attention to positioning the guard in parallelism with the blade by exerting a slight pressure against one of the longitudinal edges of the guard, whereby the edges of the slots in the guard on the same side of the longitudinal axes thereof will be engaged with corresponding sides'of the pins.

When the clamping operation is completed the edges of the blade and guard will be parallel to the longitudinal axis of the base with the result that the edges of the base, guard and blade will be parallel.

lVhile the invention has been described in connection with one of the popular blades and holders, it is evident that it is adaptable to other types of blades and holders now on the market.

The invention having been described what is claimed as new and useful is:

l. A safety razor blade having seats for engagement with holder-carried positioning means, said seats being fixed with respect to the cutting edge, lying within the perimeter of the blade and being movable towards and away from the positioning means, and means for co-action with a fixed element of the holder to move the seats into engagement with the positioning means upon relative movement of the blade and holder.

2. A safety razor blade having seats for engagement with holder-carried positioning means, said seats being fixed with respect to the cutting edge, lyingwithin the perimeter of the blade and being movable towards and away from the positioning means, and means for co-action with a fixed element of the holder to move the seats into engagement with the positioning means upon relative movement of the blade and holder in the direction of the length of the blade.

3. A safety razor blade having base pin receiving holes and a handle attaching screw receiving slot disposed with its longitudinal center line at a more acute angle to the longitudinal center line of the blade than to the transverse center line of the latter.

4. A safety razor blade having base pin seats lying in a plane parallel with the cutting edge and a handle screw engaging camedge for engaging the seats with the base pins upon movement of the blade in either direction longitudinally and with respect to a connected base, the cam edge having an angle of inclination more acute to the plane of said seats than to the transverse center line of the blade.

5. A safety razor blade having base pin engaging seats lying in a plane parallel to the cutting edge and a cam slot for the recep tion of the handle attaching stud to engage the seats with the pins upon relative movement of the base and blade in either direc tion in the length of the latter, the cam slot having an angle of inclination more acute to the plane of said seats than to the transverse center line of the blade.

6. A safety razor blade having guard aligning holder pin engaging seats and a cam for engaging a fixed handle stud to dispose the i seats against the pins upon relative movement of the blade and holder stud, the cam having an angle of inclination more acute to ture.

' WILLIAM C. ROGERS. 

